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Diapause and overwintering of the carrot fly, Psila rosae (F.) (Diptera: Psilidae)

Published online by Cambridge University Press:  10 July 2009

A. J. Burn  and
T. H. Coaker
A. J. Burn
Affiliation:
Department of Applied Biology, Pembroke Street, Cambridge CB2 3DX, UK
T. H. Coaker
Affiliation:
Department of Applied Biology, Pembroke Street, Cambridge CB2 3DX, UK
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Abstract

Psila rosae (F.) overwinters in Britain in both the larval and pupal stages. Overwintering pupae formed in October and November at soil temperatures of between 10 and 16°C entered diapause. A period of similar temperature in the laboratory during the prepupal stage also caused pupae to enter diapause. Overwintering larvae continued to feed and gain weight; they pupated in early spring at soil temperatures of 2–8°C but did not enter diapause. The sensitivity to diapause-inducing conditions decreased between November and March, associated with changes in developmental temperatures and pupal weight. The differential effects of temperature on larval, pupal and diapause development together serve to synchronise adult emergence from the overwintering population. The mechanisms which allow overwintering by a variable proportion of larvae and pupae also provide the opportunity for the development of a third generation of adult flies in October and November.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 71 , Issue 4 , December 1981 , pp. 583 - 590
Copyright
Copyright © Cambridge University Press 1981

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